US20060183967A1 - Adjustable stomach band - Google Patents

Abstract

The invention relates to an adjustable stomach band with a rigid back (4) and a chamber (2), arranged on the stoma side of the back (4), for control of stoma constriction by means of introduction or removal of fluid from the chamber (2). According to the invention, such a stomach band with a preferably automatic setting of the stoma constriction, depending on the food intake, is possible, whereby a second chamber (1) is provided to the stoma side of the back (4), directly connected to, or cooperating with the first chamber (2), such that the control of the stoma constriction is achieved by means of displacing the fluid between the chambers (1, 2) or between a reservoir (9) and the stoma-constricting chamber (2). An auto-regulation can be achieved, whereby a second chamber (1) is embodied as sensor for recording a pressure rise in the stomach and the control of the stoma constriction is achieved depending on the recorded pressure by means of displacement of the fluid from the chamber (1), or from the reservoir (9) into the stoma-constricting chamber (2).

Description

• The invention relates to a controllable gastric band including a nonextensible back and a chamber arranged on the stoma side of the back, for controlling the restriction of the stoma by supplying and discharging liquid to and from said chamber.
• The invention is directed to a further development of the controllable gastric band offered by several manufacturers in basically identical structural shapes (e.g., Swedish band by Obtech (Johnson & Johnson), Lapband by Bioenterics, . . . ). This is a band used to restrict food intake, which is wrapped around the uppermost portion of the stomach or esophagus and closed.
• WO 01/24742 A1 describes a gastric band which is positioned around the stomach and secured like a belt. The adjustment of the stoma restriction is feasible in a purely mechanical manner by contracting the band.
• U.S. Pat. No. 4,592,339 A describes a gastric band in which a chamber is arranged on the band side facing the stomach, which can be filled with liquid. A control of the stoma width is thus feasible. The filling with liquid and emptying of the system may be realized through a subcutaneously sewn-in port which is connected with the chamber of the gastric band via a flexible hose.
• Finally, WO 03/020183 A1 discloses a gastric band which is surrounded by a viscoelastic material to spare the stomach.
• The majority of presently used gastric bands yield very good long-term results in terms of weight reduction and patient satisfaction. Yet, there are some problems, which will become particularly predominant with high band fillings. Many patients have, thus, reported about unpleasant phenomena like sialemesis and regurgitation, above all, in the recumbent position. Food particles may remain in the esophagus above the stoma for a long time, start fermenting there and, hence, provoke, in addition to bad breath, an irritation of the mucous membrane involving pain. As in the event of achalasia, the permanently existing narrow position of the stoma will lead to an increasing expansion of the esophagus over months, finally causing the esophagial sensitivity to disappear and the band effect to be lost, which will subsequently lead to an increase in weight despite the highly filled gastric band provided.
• The problem faced with presently employed gastric bands consists in that the chosen filling level and, hence, the stoma width will constantly remain the same although only a restricted food intake is sought.
• Departing from the prior art with the presently used gastric band, the invention aims to provide a gastric band that enables the preferably automatic adjustment of the stoma width. What is aimed at is a gastric band that is set to be narrow only during food intake, yet, for the remaining time, is wide enough not to produce any negative secondary effects. The band is to contract during eating and expand again after having stopped the ingestion of food.
• The object according to the invention, on the one hand, is achieved in that a second chamber is provided on the stoma side of the back, which second chamber communicates with the first chamber in a manner to ensure the control of the stoma restriction by a displacement of the liquid between the one chamber and the other chamber. A regulation of the gastric band and, hence, of the stoma restriction is, thus, feasible by a displacement of the liquid between two chambers without adding or diverting liquid from or to the outside. The unequal distribution of the liquid between the two chambers will cause a narrower stoma at the level of the higher filled chamber. Thereby, a gastric band including a liquid circulation is provided.
• The object according to the invention is also achieved in that a second chamber is provided on the stoma side of the back, which second chamber is designed as a sensor for the detection of a pressure increase in the stomach or esophagus, and that the other chamber via the sensory chamber is connected with a reservoir in a manner to ensure the control of the stoma restriction by a displacement of the liquid between the reservoir and the stoma-restricting chamber as a function of the pressure detected by the sensory chamber. This embodiment provides a double-circulation system with the sensory chamber constituting a liquid space and the stoma-restricting chamber, together with the reservoir, constituting the second liquid space. Unlike with a single-chamber circulation system, in which a liquid displacement from the one chamber into the other chamber takes place, a displacement of the liquid from the reservoir into the stoma-restricting chamber, and vice versa, is, thus, provided as a function of the pressure detected by the sensory chamber. The two chambers are, therefore, in an active connection with each other.
• In a preferred manner, the chambers are arranged one beside the other, with the stoma-restricting chamber being located aborally.
• The second chamber may also be subdivided into two communicating chambers delimiting the stoma-restricting chamber on either side. The stability of the gastric band is thereby increased.
• It is likewise feasible that the chambers are arranged one above the other in respect to the stomach or esophagus, with the sensory chamber being arranged on the gastric wall.
• A layer may be provided between the chambers.
• A device for pumping liquid is preferably provided to displace the liquid from one chamber, or the reservoir, into the stoma-restricting chamber, and vice versa.
• The pumping device is comprised of an electrically or mechanically driven pump such as, for instance, a lift-and-force pump. If a mechanically driven pump such as, for instance, a lift-and-force pump is employed, the energy taken up by the sensory chamber is used to inflate the stoma-restricting chamber.
• In order to achieve an auto-regulation of the stoma restriction by the aid of the gastric band, a device for detecting the eating activity is advantageously provided.
• The detection of the eating activity may be realized by a detection of the deglutition activity, a detection of the pressure prevailing at the gastric wall or wall of the esophagus, or by a detection of the peristaltic wave. To detect the pressure prevailing at the gastric wall or wall of the esophagus, a pressure sensor connected to an electronic circuit may be provided in the sensory chamber.
• According to a further characteristic feature of the invention, it is provided that the detection device is connected with the pumping device in a manner that, after having detected the eating activity, liquid is pumped from the sensory chamber, or reservoir, into the stoma-restricting chamber and the liquid is again returned from the stoma-restricting chamber into the second chamber, or reservoir, at a given time after the detection of a stop of the eating activity. This enables an automatic stoma restriction to occur as a function of the food intake.
• According to a variant embodiment of a gastric band having but one liquid circulation in a purely mechanical fashion, the chambers are connected with each other via an auxiliary chamber functioning as an air chamber, wherein a valve is arranged between the second chamber and the auxiliary chamber, which valve allows the transport of liquid only from the second chamber to the auxiliary chamber, and wherein a further valve is arranged between the auxiliary chamber and the stoma-restricting chamber, which further valve allows the transport of liquid only from the auxiliary chamber to the stoma-restricting chamber.
• In the event of a gastric band including two liquid circulations, an auxiliary chamber functioning as an air chamber may likewise be arranged in the connection between the reservoir and the stoma-restricting chamber. It is thereby feasible to temporarily store, for a short time, the energy produced by a pressure increase in the stomach or esophagus and use the same only subsequently to inflate the stoma-restricting chamber. It is thereby achieved that the stoma-restricting chamber is only activated after the peristaltic wave has subsided.
• In order to enable a liquid exchange between the stoma-restricting chamber and the second chamber or reservoir, respectively, a device for carrying out a liquid exchange from the stoma-restricting chamber to the second chamber or reservoir, respectively, is provided.
• Said device for carrying out a liquid exchange from the stoma-restricting chamber to the second chamber or reservoir, respectively, may be comprised of a common partition wall arranged between the chambers or chamber and reservoir, respectively, and containing micropores. Through these micropores contained in the partition wall between the adjacently arranged chambers of the gastric band or chamber and reservoir, respectively, a slow continuous liquid exchange takes place.
• The device for carrying out a liquid exchange may, however, also be comprised of a back flow channel arranged between the chambers or the stoma-restricting chamber and reservoir, respectively.
• Within the same, a throttle valve or the like may be arranged to throttle the liquid flow, permitting it in only one direction.
• According to a further characteristic feature of the invention, it is provided that the sensory chamber is connected to a stomach pacemaker or a device emitting electric pulses so as to obtain a stimulation of the gastric wall by electric pulses as a function of the pressure prevailing in the stomach or esophagus and detected by the sensory chamber. A stimulation of the stomach or esophagus can thereby be carried out during food intake.
• In addition, a further liquid-filled chamber may be provided for the adaptation of the gastric band, which chamber has neither a sensoring nor a stoma-restricting function in the context of the controllable gastric band, but serves to adapt the gastric band to the respective circumstances. Said further chamber is arranged above the sensory and stoma-restricting chambers of the gastric band and jointly wrapped around the uppermost stomach portion or esophagus and secured.
• In an advantageous manner, said further chamber is connected with a port to be subcutaneously arranged in a manner to allow liquid to be filled into, or removed from, said chamber by supplying or discharging liquid through said port and, hence, enable an adaptation of the gastric band. Naturally, also several chambers may be provided to adaptat the gastric band.
• The invention will be explained in more detail by way of the attached Figures.
• Therein:
• FIG. 1 is a schematic cross section through an embodiment of a gastric band including a liquid circulation in the state of an equal distribution of the liquid filling in the two chambers;
• FIG. 2 is a schematic cross section through the gastric band according toFIG. 1 after the displacement of liquid into the stoma-restricting chamber;
• FIG. 3 is a schematic cross section through a further, embodiment of a controllable gastric band including two liquid circulations and an electrically driven pump;
• FIG. 4 is a schematic cross section through a further mechanical embodiment of a controllable gastric band including two liquid circulations;
• FIG. 5 is a perspective view of a further embodiment of a controllable gastric band; and
• FIGS. 6aand6bare sectional views through the gastric band ofFIG. 5 with different filling levels of the stoma-restricting chamber.
• The gastric band illustrated inFIGS. 1 and 2 comprises anonextensible back4 like the bands presently in use. On the side of theback4 facing thegastric wall13, twochambers1,2 are arranged to be interconnected in a manner to enable a displacement of liquid betweenchambers1 and2. Thechambers1,2 facing thegastric wall13 extend circularly around the stomach or esophagus like in conventional gastric bands including just one chamber. In the exemplary embodiment illustrated, anauxiliary chamber3 functioning as an air chamber is provided on the outer side of theback4 facing away from thegastric wall13. Theauxiliary chamber3 is connected with the twochambers1,2. Avalve5 arranged between thechamber1 and theauxiliary chamber3 permits the outflow of liquid from thechamber1 into theauxiliary chamber3. Afurther valve6 arranged between the stomach-restrictingchamber2 and theauxiliary chamber3 permits the outflow of liquid from theauxiliary chamber3 into the stomach-restrictingchamber2. The passage of solid food through the stoma, thus, causes an increase in the pressure prevailing in the twochambers1,2 bordering on thegastric wall13, from a resting pressure p1 to a pressure p2. Liquid is, thus, pressed from thechamber1 into theauxiliary chamber3. Thevalve5 prevents a backflow from theauxiliary chamber3 into thechamber1. On account of its function as an air chamber, theauxiliary chamber3 stores the elevated pressure p2. After the passage of a bite through the stoma, the liquid pressure in the two gastric-wall-near chambers1 and2 again drops to the resting pressure p1. Theauxiliary chamber3, which is under the elevated pressure p2, subsequently evacuates the liquid into the stoma-restrictingchamber2. In this case, liquid is, thus, displaced from thechamber1 into the stoma-restrictingchamber2 via the purely mechanical pumping mechanism caused by the passage of solid food through the stoma. The stoma opening at the level of thechamber2 is thereby narrowed, as is schematically illustrated inFIG. 2. The displacement of the liquid occurs continuously during eating. Following eating the band is widened again after a predetermined time, by a backflow from the stoma-restrictingchamber2 into thechamber1 being triggered. The optimum time for this liquid exchange must be determined in clinical studies. The exemplary embodiment according toFIGS. 1 and 2 comprises a gastric band including a liquid circulation formed throughchambers1,2 and theauxiliary chamber3. In the example illustrated, the liquid exchange takes place via micropores provided in the partition wall between the adjacently arrangedchambers1 and2. In this manner, a slow continuous liquid exchange occurs. The pumping procedures may be controlled either electronically or mechanically.
• The aim of the autoregulatory change of the stoma width is, thus, achieved by a displacement of the liquid from one chamber into the other chamber. Unlike the initial state of the liquid amount equally distributed in the two chambers, an unequal distribution implies a stoma restriction in the region of one chamber and a stoma expansion at the level of the other chamber. In terms of effect on the bearer of the gastric band, this means a stoma restriction and, hence, a complication of the eating procedure.
• The embodiments of gastric bands illustrated inFIGS. 3 and 4 are variants for which two liquid circulations are provided. The gastric band has a nonextensible back4 like the bands presently in use. On the side of theback4 facing thegastric wall13, twochambers1,2 are located, which are in active connection. Thechamber1, which is arranged cranially relative the stomach, functions as a sensor, detecting the movements of the stomach and esophagus caused during the ingestion of food. Thechamber2 located beside thesensory chamber1 serves to restrict the stoma and communicates with areservoir9. From thisreservoir9, liquid can be pumped into thechamber2 and, from there, back into thereservoir9. Anelectronic circuit11, for instance, serves to establish the active connection betweenchambers1 and2 by detecting the pressure taken up by thesensory chamber1, and accordingly triggering anelectric pump12. Theelectric pump12 conveys liquid from thereservoir9 into thechamber2, thus causing a restriction of the stoma. The restriction of the stoma is, thus, effected after the passage of food has been detected by thechamber1. During the passage of swallowed food, the pressure within thechamber1 rises such that a controllable gastric band of conventional design can be used as a sensor for the deglutition activity. The displacement of liquid from thereservoir9 into thechamber2 causes a restriction of the stoma, which will widen again at a return displacement of the liquid into thereservoir9.
• FIG. 4 depicts a variant of the controllable gastric band according to the invention, in which the connection between thechamber1 and thechamber2 connected with thereservoir9 is realized via a lift-and-force pump14. In this instance, the pressure rising in thesensory chamber1 during the ingestion of food is used to inflate thechamber2. The liquid in thesensory chamber1, thus, actuates the lift-and-force pump14 and, through appropriately arrangedvalves7,8, causes a liquid flow from thereservoir9 into thechamber2 and, hence, the inflation of thechamber2, followed by a restriction of the stoma. Due to the arrangement of anauxiliary chamber3 functioning as an air chamber, between thevalve8 and afurther valve10, a delayed liquid flow will occur, and hence a delayed restriction of the stoma will be obtained. The backflow of the liquid from thechamber2 into thereservoir9 may occur through abackflow channel17 in which athrottle valve15 may, for instance, be arranged, which causes the stoma restriction to be slowly released. The pumping mechanism is, thus, deactivated after having finished eating, causing a slow backflow of liquid from thechamber2 into thereservoir9. The liquid backflow takes place without consuming any energy because of a pressure gradient prevailing between the stoma-restrictingchamber2 and thereservoir9. A pressure gradient necessarily exists between thechamber2 and thereservoir9, since thereservoir9 is located outside theback4 and, therefore, does not participate in the rise of the resting pressure occurring simultaneously with the filling of the stoma-restrictingchamber2.
• The variant embodiment according toFIG. 4 further differs from that ofFIG. 3 in that the twochambers1,2 are arranged one above the other relative to thegastric wall13. In this case, thechambers1,2 are radially superimposed with thesensory chamber1 being located on thegastric wall13 or wall of the esophagus and thechamber2 being arranged above thechamber1, optionally upon interposition of alayer16. From the arrangement ofchambers1,2 one above the other, a pressure situation differing from that with adjacently arrangedchambers1,2 results. In the event of superimposedchambers1,2, no liquid backflow from the stoma-restrictingchamber2 into thesensory chamber1 would occur with a single-circulation system according toFIGS. 1 and 2 because of the same pressure prevailing in the twochambers1,2, since both of saidchambers1,2 are arranged one above the other between thegastric wall13 and theback4. A restriction by a liquid displacement from thesensory chamber1 into the stoma-restrictingchamber2 will only occur if the stoma-restrictingchamber2 is narrower than thesensory chamber1. Thus, the pressure gradient problem has, at the same time, been overcome. For the force exerted by the twochambers1,2 on the common boundary surface A, F=p.A applies. Due to the larger surface by which thesensory chamber1 joins the common boundary surface, the force exerted by thesensory chamber1 is larger than that of the stoma-restrictingchamber2 having a smaller contact surface. The stoma-restrictingchamber2 consequently tends to empty into thesensory chamber1. After having finished eating, the liquid flows back into thesensory chamber1 and the stoma width increases again.
• No electric energy is needed for the variant including a lift-and-force pump14 according toFIG. 4.Chambers1,2 comprise, for instance, the whole periphery.
• As opposed to the single-circulation system according toFIGS. 1 and 2, the double-circulation system according toFIGS. 3 and 4 does not involve any problems in respect to the functioning of the restriction with any arrangement of thechambers1,2. Liquid will always be displaced from areservoir9 into the stoma-restrictingchamber2, thus necessarily reducing the stoma width. By contrast, in a single-circulation system, the displacement of liquid from thesensory chamber1 into the stoma-restrictingchamber2 will only cause a stoma restriction, if thechambers1,2 are arranged one beside the other. If the twochambers1,2 were arranged radially above each other, the displacement of liquid from the onechamber1 into the stoma-restrictingchamber2 would not lead to any change in the width of the stoma. This will only be reached if the chamber into which the liquid is pumped is designed to be narrower than the chamber from which the liquid is removed. If the stoma-restricting chamber is narrower, it will be higher with the same amount of liquid, and the stoma width will, hence, be smaller. The displacement of liquid from the wider chamber into the narrower chamber will, thus, cause a stoma restriction.
• FIG. 5 in a perspective view illustrates a further embodiment of a gastric band, wherein thesensory chamber1 and the stoma-restrictingchamber2 are arranged on the nonextensible back4 one beside the other along the periphery of the gastric band. Theauxiliary chamber3, via which the liquid is pumped fromchamber1 to the stoma-restrictingchamber2 or areservoir9 connected to the stoma-restrictingchamber2, respectively, is provided outside theback4. The gastric band is wound around the uppermost portion of the stomach or esophagus and closed. In the exemplary embodiment illustrated, the twochambers1,2 each occupy only a portion of the circumference. In addition, afurther chamber18 may be provided, which has neither a sensory nor a stoma-restricting function in the context of the controllable gastric band, but serves to adapt the gastric band to the respective circumstances. To this end, theelongate chamber18 is arranged above thechambers1,2 of the gastric band and, together with the same, is wound around the uppermost portion of the stomach or esophagus and secured. Thechamber18 is connected with a subcutaneously arrangedport20 via asuitable duct19 in a manner known per se. The adaptation of the gastric band is, thus, feasible by supplying or discharging liquid into or from thechamber18 viaport20.
• FIGS. 6aand6billustrate sections through such a gastric band according toFIG. 5 in the region of the stoma-restrictingchamber2. InFIG. 6a, the stoma-restrictingchamber2 is not much filled such that thechamber18 is pressed against the gastric wall13 (not illustrated) to a lesser degree than in the situation according toFIG. 6b, in which the stoma-restrictingchamber2 is appropriately filled with liquid and thechamber18 is, hence, pressed against thegastric wall13 or wall of the esophagus, whereby a restriction of the stoma is caused. Thisadditional chamber18 which does not take part in the autoregulatory system, thus, allows for the optimum adaptation of the gastric band from outside viaport20.
• The sensory function of the gastric band renders feasible a new approach to the concept of a stomach pacemaker. By combining a gastric band operating as a sensor with a pacemaker, the stimulation of the gastric wall by electric pulses can be limited to the periods of food intake. By the suitable placement of the pacemaker probes in the region of the lower esophagus sphincter, it would also be possible to cause an activation of this constrictor muscle and, hence, a restriction of the food passage. The restriction will then be caused by a physiologically inherent structure rather than the active chamber.

Claims (24)

1. A controllable gastric band including a nonextensible back (4) and a chamber (2) arranged on the stoma side of the back (4), for controlling the restriction of the stoma by supplying and discharging liquid to and from said chamber (2), characterized in that a second chamber (1) is provided on the stoma side of the back (4), which second chamber (1) communicates with the first chamber (2) in a manner to ensure the control of the stoma restriction by a displacement of the liquid between the one chamber (1) and the other chamber (2).

2. A controllable gastric band including a nonextensible back (4) and a chamber (2) arranged on the stoma side of the back (4), for controlling the restriction of the stoma by supplying and discharging liquid to and from said chamber (2), characterized in that a second chamber (1) is provided on the stoma side of the back (4), which second chamber (1) is designed as a sensor for the detection of a pressure increase in the stomach or esophagus, and that the other chamber (2) via the sensory chamber (1) is connected with a reservoir (9) in a manner to ensure the control of the stoma restriction by a displacement of the liquid between the reservoir (9) and the stoma-restricting chamber (2) as a function of the detected pressure.

3. A gastric band according toclaim 1, characterized in that the chambers (1,2) are arranged one beside the other, with the stoma-restricting chamber (2) being located aborally.

4. A gastric band according toclaim 3, characterized in that the second chamber (1) is subdivided into two communicating chambers delimiting the stoma-restricting chamber (2) on either side.

5. A gastric band according toclaim 1, characterized in that the stoma-restricting chamber (2) and the sensory chamber (1) are arranged one above the other in respect to the stomach or esophagus, with the sensory chamber (1) being arranged on the gastric wall (13).

6. A gastric band according toclaim 5, characterized in that a layer (16) is provided between the chambers.

7. A gastric band according toclaim 1, characterized in that a device for pumping liquid liquid from one chamber (1), or the reservoir (9), into the stoma-restricting chamber (2) and vice versa is provided.

8. A gastric band according toclaim 7, characterized in that the pumping device is comprised of an electric pump (12).

9. A gastric band according toclaim 7, characterized in that the pumping device is comprised of a mechanically driven pump, for instance a lift-and-force pump (14).

10. A gastric band according toclaim 1, characterized in that a device for detecting the eating activity is provided.

11. A gastric band according toclaim 10, characterized in that the detection device is comprised of a device for detecting the deglutition activity.

12. A gastric band according toclaim 10, characterized in that the detection device is comprised of a device for detecting the pressure prevailing at the gastric wall (13) or wall of the esophagus.

13. A gastric band according toclaim 12, characterized in that a pressure sensor is provided in the sensory chamber (1) to detect the pressure prevailing at the gastric wall (13) or wall of the esophagus, said pressure sensor being connected with an electronic circuit (11).

14. A gastric band according toclaim 10, characterized in that the detection device is comprised of a device for detecting the peristaltic wave.

15. A gastric band according toclaim 1, characterized in that the detection device is connected with the pumping device in a manner that, after having detected the eating activity, liquid is pumped from the sensory chamber (1), or reservoir (9), into the stoma-restricting chamber (2) and the liquid is again returned from the stoma-restricting chamber (2) into the second chamber (1), or reservoir (9), at a given time after the detection of a stop of the eating activity.

16. A gastric band according toclaim 1, characterized in that the chambers (1,2) are connected with each other via an auxiliary chamber (3), wherein a valve (5) is arranged between the second chamber (1) and the auxiliary chamber (3), which valve allows the transport of liquid only from the second chamber (1) to the auxiliary chamber (3), and that a further valve (6) is arranged between the auxiliary chamber (3) and the stoma-restricting chamber (2), which further valve allows the transport of liquid only from the auxiliary chamber (3) to the stoma-restricting chamber (2).

17. A gastric band according toclaim 1, characterized in that an auxiliary chamber (3) functioning as an air chamber is arranged between the reservoir (9) and the stoma-restricting chamber (2).

18. A gastric band according toclaim 1, characterized in that a device for carrying out a liquid exchange from the stoma-restricting chamber (2) to the second chamber (1) or reservoir (9), respectively, is provided between the stoma-restricting chamber (2) and the second chamber (1) or reservoir (9), respectively.

19. A gastric band according toclaim 18, characterized in that said device for carrying out a liquid exchange is comprised of a common partition wall containing micropores and arranged between the chambers (1,2) or between the stomach-restricting chamber (2) and the reservoir (9), respectively.

20. A gastric band according toclaim 18, characterized in that the device for carrying out a liquid exchange is comprised of a backflow channel (17) arranged between the chambers (1,2) or the stoma-restricting chamber (2) and the reservoir (9), respectively.

21. A gastric band according toclaim 20, characterized in that a throttle valve (15) is arranged within the backflow channel (17).

22. A gastric band according toclaim 1, characterized in that the sensory chamber (1) is connected to a stomach pacemaker or a device emitting electric pulses so as to obtain, via appropriately placed probes, a stimulation of the gastric wall by electric pulses as a function of the pressure prevailing in the stomach or esophagus and detected by the sensory chamber (1).

23. A gastric band according toclaim 1, characterized in that a further liquid-filled chamber (18) is provided for the adaptation of the gastric band.

24. A gastric band according toclaim 23, characterized in that said further chamber (18) is connected with a port (20) to be subcutaneously arranged in a manner that liquid can be filled into, or removed from, said chamber (18) by supplying or discharging liquid through said port (20).

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